Lamp guard



H.- A. HEINEL LAMP GUARD Nov. 3, 1931.

Filed Feb. 26, 1330 1 a its Patented Nov. 3, 1931 UNITED STATES PATENT OFFICE HARRY A. HEINEI, OF NENV CASTLE, DELAWARE, ASSIGNOR TO WILMINGTON FIBRE SPECIALTY CGMPANY,-OF WILMINGTON, DELAW'ARE, A CORPORATION LAMP GUARD Application filed February 26, 1930. Serial No. 431,494.

he present invention relates to lamp guards, and particularly to a lamp guard constructed entirely of insulating material, and so fabricated that it is held together by interlocking of the parts, so that no rivets or other extraneous mechanical fastening means are required.

The principal object of the invention is to provide such a lamp guard constructed completely of non-metallic insulating material, which eliminates all possibility of short cirouiting when the guard comes in contact with mental parts, and which is particularly, though not exclusively, adapted for use with portable lamps, for example, for telephone repairs; or for any other purpose where it outerring 18, whose inner surface is cut away necessary to place a light close to exposed metal parts carrying electric current.

Other objects include the provision of such a lamp guard that is not affected by oil, water or changes in temperature, and that is possessed of inherent strength and durability.

In the accompanying drawings, which illustrate a preferred embodiment of the invention,

1 is a perspective view showing the lamp guard attached to a lamp socket;

Fig. 2 is a central longitudinal section through the lamp guard of Fig. 1;

Fig. 3 is a sectional view taken on the line 8-3 of Fig. 2; and

Fig. 4c is a sectional view taken on the line 14 of Fig. 2.

Referring in detail to the accompanying drawings, all of the material of which the guard is constructed is vulcanized fibre; or it may be a phenolic condensation product, or any other insulating material.

The guard includes a plurality of fibre strips 11 arranged circumferentially about a central axis, and these strips are bent inwardly toward one end which is attached to a lamp socket as illustrated in Fig. 1.

The circumferentially arranged series of fibre strips 11 is held as an integral unit by a plurality of pairs of cooperating bracing rings, also constructed of vulcanized fibre or equivalent insulating material. As shown particularly in Figs. 2, 3 and 4, a pair of attaching end rings are provided at the small strips 11 fit.

by dipping the guard in a bath,

end of'the guard, and include an inner ring 12, which is right-angular in cross section to provide an annular shoulder 13 lying substantially parallel to the axis of the guard, and an end abutment shoulder 14 whose face lies in a radial plane with respect to the guard axis. e

For cooperation with the ring 12 the longitudinally extendingfibre strips 11 are bent radially outward as shown in Fig. 2. The ra dially extending ends 15 of the strips 11 lie against the abutment shoulder ll of the innor ring 12, and the horizontal portion 16 of each strip adjacent its end 15 lies against the annular shoulder 13 ofthe ring 12.

Cooperating with the inner ring 12 is an at radially spaced intervals to provide grooves 19,i'nto which the portions 16 of the Those portions of the inner surface of the 'outer ring 18' lying between any two adjacent grooves 19'contact with the shoulder13 of the inner ring 12, as shown at 20, Fig. 4.

At the open larger end of the lamp guard an inner ring 22 'is provided'with radially spaced grooves 23"to receive the outer ends of the strips 11, and an outer ring 25 clasps this assembly and holds the strips in their grooves. An intermediate pair of bracing rings are provided, the inner ring 27 of which is sim- 11:11 in construction and function to the end innerring 22, and the outer ring 28 of which is similar in construction and function to the -All joints are covered with waterproof cement, and then subjected to pressure. The

joints are thus effectively prevented from working loose, the cement being in the nature of an extra precaution, since the assembly itself is such as to hold the parts in assembled position; 7 r The lamp guard is then completely covered witha protective coating, by which it is rendered impervious to oil and water. This coating is applied'by either a spray brush or As shown in Fig. 1, the lamp guard is provided with a rubber handle 30, which is molded to permit the insertion therein of a standard keyless socket 31. This socket is held in place with the lamp guard, which is forced into the handle 30, and is retained solely by the pressure of the rubber, so that no screws, clamps or other holding devices are required.

A fibre hook consisting of a hook portion 33 and a split ring portion 34-. by which it is movably secured to the outer end rings 25 and 22 may be assembled with the guard if desired, for the purpose of temporarily holding the device in position.

The foregoing construction provides a la mp guard which entirely surrounds and insulates a metal lamp socket, and which can be used with standard sockets and lamps, so that a special socketis not required. Moreover, the construction described. eliminates all neces ity for us metal rivets or other conducting holding means, and the molded rubber handle itself keeps the guard in place without the employment of clamps or other holding devices.

What is claimed is:

1. A lamp guard including a circumferentially arranged series of fiber strips. aplurality of spaced apart fiber locking rings each having cut-away portions interlocking with said strips, and a fiber holding ring cooperating with each of said locking rings and holdingsaid strips in said cut-away portions, one of said locking rings and one of said holding rings being located at one end of the series of strips, one of said rings having a circumferentially extending shoulder, and the cooperating ends of said strips being bent radially of the series to lie against said shoulder.

2. A lamp guard including a circumferentially arranged series of fiber strips, a plurality of spaced apart locking rings each having peripheral cut-away portions interlocking with said strips, and a solid fiber holding ring surrounding each of said locking rings and holding said strips in engagement with said cut-away portions, one of said looking rings and one of said holding rings being located at one end of the series of strips, one of said rings having a circumferentially extending shoulder, and the cooperating ends of said strips being bent radially of the se ries to lie against said shoulder.

3. A lamp guard including a circumferentially arranged series of fiber strips, a plurality of spaced apart fiber locking rings each having cut-away portions interlocking with said strips and a fiber holding ring cooperating with each of said locking rings and holding said strips in said cut-away portions; one of said locking rings being of a reduced size and adapted to circumferentially retain a miniature electric socket.

4*. In a device of the character described. 

